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Service Manual – Driving Axle 1.5 Table of Tightening Torque for Common Bolts Bolt Strength grades 4.6 5.6 6.8 8.8 10.9 12.9 Screw Strength grades 4.6 5.6 6.8 8.8 10.9 12.9 Screw Strength grades 4.6 5.6 Yield Strength (N/mm2) 240 300 480 640 900 1080 Yield Strength (N/mm2) 240 300 480 640 900 1080 Yield Strength (N/mm2) 240 300 6.8 6 4~5 5~7 7~9 9~12 13~16 16~21 16 90~110 110~140 145~193 193~257 280~330 326~434 27 Nominal Diameter of Bolts(mm) 8 10 12 Tightening Torque(N·m) 10~12 12~15 17~23 22~30 30~36 38~51 20~25 25~32 33~45 45~59 65~78 75~100 36~45 45~55 58~78 78~104 110~130 131~175 Nominal Diameter of Bolts (mm) 18 20 22 Tightening Torque (N·m) 120~150 150~190 199~264 264~354 380~450 448~597 170~210 210~270 282~376 376~502 540~650 635~847 230~290 290~350 384~512 521~683 740~880 864~1152 Nominal Diameter of Bolts (mm) 30 33 36 Tightening Torque (N·m) 450~530 550~700 540~680 680~850 480 714~952 969~1293 8.8 640 10.9 900 12.9 1080 952~ 1269 1400~ 1650 1606~ 2142 1293~ 1723 1700~ 2000 2181~ 2908 670~880 825~1100 1319~ 1759 1759~ 2345 2473~ 3298 2968~ 3958 14 55~70 70~90 93~124 124~165 180~210 209~278 24 300~377 370~450 488~650 651~868 940~1120 1098~1464 39 900~1100 1120~1400 928~1237 1160~1546 1694~2259 1559~2079 2259~3012 2923~3898 2800~3350 4111~5481 3812~5082 4933~6577 Remark: The tightening torque of joint bolts can be executed referred this previous table during the assembling operation. When the tightening torque given in the chapter IV is not accord with the table, it should be executed according with the tightening torque given in the chapter IV. 6